Arriving to Berlin in June - July - PLZ help !!!!

I'll be visiting Berlin during June - July months (not sure of the dates yet)

It's my first time so I really need some recommendations about:- annual events during those months (clubbing, music concerts)- hip clubs with hipsters population - trendy coffee houses and bars- good places to meet creative and interesting people (I'm a fashion designer)- nice and cheap hotel in the center of the action